[Gmecm] What is the "Idle Spark Multiplier"s function?

[Ryan Hess]

In 8D, there is an idle spark multiplier vs MAP table, that is filled with 0.996 all the way.  In other codes - eg $A1, and $DF, they are filled like so:

20kpa - 0.625
26kpa - 0.625
32kpa - 0.617
38kpa - 0.602
44kpa - 0.5
49kpa - 0.5
55kpa - 0.5
61kpa - 0.375

The question is, why would there be a need to change the spark advance by MAP?  Or specifically the way they did it?  It would make sense that an increasing load would need more spark advance to keep the RPM the same, but isn't that taken care of with the idle advance/retard tables?  Besides that, this table seems to take OUT timing with increasing load.

Ryan

 		
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